Issue |
Knowl. Managt. Aquatic Ecosyst.
Number 400, 2011
|
|
---|---|---|
Article Number | 11 | |
Number of page(s) | 14 | |
DOI | https://doi.org/10.1051/kmae/2011023 | |
Published online | 25 April 2011 |
Fish assemblage structure in the Chishui River, a protected tributary of the Yangtze River
Structure des communautés piscicoles de la rivière Chishui, un affluent protégé du fleuve Yangtzé
(1) Institute of Hydrobiology, Chinese
Academy of Sciences, 7th southern
road of East Lake, Wuhan, Hubei
Province, 430072, P.R. China
wangjw@ihb.ac.cn
(2)
Graduate University of Chinese Academy of Sciences,
Beijing,
100039, P.R.
China
(3)
Key Laboratory of biodiversity and conservation of aquatic
organisms, Chinese Academy of Sciences, Wuhan, Hubei
Province, 430072, P.R. China
Received: 18 November 2010
Revised: 14 March 2011
Accepted: 16 March 2011
This study aimed to characterize fish assemblage and evaluate environmental influence on fish distribution in the Chishui River, a protected tributary of the upper Yangtze River. Thirty-one sites regularly distributed in longitudinal profiles were sampled in April, 2007. Sixty-two fish species belonging to 3 orders, 8 families, and 52 genera were collected. Species richness and diversity significantly increased from upstream to downstream. Canonical correspondence analysis (CCA) highlighted five environmental variables (altitude, conductivity, dissolved oxygen, channel width and current velocity) significantly structuring fish assemblages in the Chishui River. Based on species distributions and fish-habitat relationships, conservation strategies were proposed for different reaches.
Résumé
Cette étude caractérise les communautés de poissons et évalue l’influence environnementale sur la distribution piscicole dans la rivière Chishui, un affluent protégé du fleuve Yangtzé. Trente-et-un sites régulièrement répartis sur le profil longitudinal ont été échantillonnés en avril 2007. Soixante-six espèces de poissons appartenant à 3 ordres, 8 familles et 52 genres ont été collectées. La richesse et la diversité spécifique augmentent significativement de l’amont vers l’aval. L’analyse canonique des correspondances (CCA) identifie cinq variables environnementales (altitude, conductivité, oxygène dissous, largeur du lit et vitesse du courant), structurant significativement les communautés de poissons dans la rivière Chishui. À partir des distributions spécifiques et des relations habitat-poisson, des stratégies de conservation sont proposées pour les différents biefs.
Key words: Chishui River / fish distribution / environmental variables / canonical correspondence analysis (CCA) / fish conservation
Mots clés : rivière Chishui / distribution de poissons / variables environnementales / analyse canonique des correspondances (CCA) / conservation piscicole
© ONEMA, 2011
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